In the world of DIY, self-help repairs can get dicey quick. The problems are not always with the ability to do the repair itself successfully — but doing so with real savings. Having additional parts lying around is a big help, but if you have to make a purchase, it’s critical to know what you really need to buy. With the iPhone 3GS, the earpiece speaker can often go bad. There are not many pieces involved — you can buy all of the parts that might have gone bad in a package for about $20. But if you know exactly what you need, you might get the job done for just a couple of bucks.
